reviews. so, he's a connoisseur? in addition to be a chemist. >> in addition. >> reporter: the lapd keeps a copy in the drug lab. what worries you most about this stuff? >> well, clearly chance when people, you know, are under the influence of a drug like this, it's, you know, anything's possible. >> reporter: it's possible johnny lewis will turn out to be the poster boy for this dangerous new drug. or, maybe, there's another explanation. when you heard about this case, did you think, ah-ha, he must be on one of these things? >> not necessarily. there's other drugs that cause it, so -- >> reporter: such as? >> pcp, for example. >> reporter: whatever it was, it is a tragedy. i'm david wright for "nightline" in los angeles. >> our thanks to david wright. still ahead, how ben affleck found rebirth and redemption in a director's chair and how a most thrilling history lesson has mihm awash in oscar buzz.